Thermal Diffusion near the Critical Solution Point

Abstract

Thermal diffusion measurements have been carried out near the critical solution point by means of a new apparatus which will be described in another paper. The Soret coefficient D′/D for nitrobenzene+n-hexane shows a large increase in the vicinity of this point. This is a strong argument in favor of the existence of a thermodynamical factor in the isothermal diffusion coefficient as predicted by the thermodynamics of irreversible processes.